Dustproof lighting unit



INVENTOR Zergy Do /1e u ATTORNEY Jan. 14, 1930.

1.. c. DOANE DUSTPROOF LIGHTING UNIT Filed April 15. 1928 Patented Jan.14, 1930 1 UNITED PATENT OFFICE LEROY 6-. DOANE, F MERIDEN, CONNECTICUT.T-HE MILLER GGMPANY, OF MERIDEN, CONNECTICUT; A CORPQRATION"0FGON-NECIICUT DUfiTPRQQF LIGHTING UNIT Application filed April 13 Thepresent invention relates to dustproof lighting units and is moreparticularly directed' toward a lighting unit suitable for use where itis exposed and subject, 119 Wind, weather and vibration.

The present invention contemplates an; inclosed lighting unit suitablefor the [above purposes wherein a single inclosing glass globe ismounted about the light source in 10 such a manner that the entrance ofdust or rain is efl'ectively prevented while at the same time theinclosingjglobe maybe readily released for inspection, clean-ing orreplacement. The invention also contemplates a 5suitable form of globesupport which cap able of being made. out of heavy rugged parts whichwill withstand vibration and at the same time provide a weatherproofinclosure for the electrical parts of the unit.

Another object of the invention is to provide 'a unit of this nature inwhich it is unnecessary to use any tools when removing or replacing aglobe.

The accompanying drawings show, for purposes of illustrating the presentinventioni one of the many possible embodiments in which the inventionmaytake form, it being understood that the drawings are illus trative ofthe invention rather than limiting the same.

In these "drawings:

Figure 1 is a vertical sectional view through the lighting unit withparts in ele vation; and

Figure 2 is a horizontal section view on the line 22 of Figure 1,

In the present form of construction the upper part. of the lighting unitismade in the 01111- of a canopy 1. -0- havingia downwardly nd inw rdlyon ers ng por n ind c ted at 11, and provided with a. plurality of inward-ly extending lugs 12% drilled. to receive screws 13. This canopy 1Qbe conmeniently made in the form of a heavy wl lgg aluminum castingandisdetachably fastened to aring-likemombrlk. Y

h r g-likemember 14 functions, in the present, form of construction, asboth a socket support anda globe support. Ashore shown 50 it is providedwith an inwardly directed was. senat 26916 3- flange 15v in which ismounted a lamp socket indicated at 16. The screws 13 are threaded intosuitabletapped holes in this flange so as to fasten the members 10 andli together.

un t may h s ppo by ns Of P- porting rods fastened to a crossbar 18 andprovided at their lower ends with nuts 19,, The lower portion of thering-like member L4: provided, as here shown, with three downwardly andoutwardly extendinglugs- 29. Each of these lugs has a horizontal portion2 1, a vertical portion 22 and a lower horiaontaL foot pe e 2 The upperce. o the horizontal portion 21 is notched as indicated at 2 1 toreceive a comparatively rigid sheet metal finger This finger extendsinward- 1y indicated in the drawing. and passes through a slot 25in thelug. The inner upper end of the finger 25 is provided with a hookedend'26 which is passed up into the Slot the-lug, the finger 25 alsoextending outwardly and downwardly as indicated. The free end 27 of thefinger extends beyond the foot 23 The finger issupported and held inplace on the lug bymea'ns of a coiled, spring 25 wound around'a pin 29which is fastened to the" finger and which passes through a hole in thefoot 23 as indicated.

The outer surface of the ring-like member 14 is as here shown slightlylarger in diameter than the lower portion of the canopy. This outersurface of the ring is threaded as indicated at 30 and a cover ring.- 31is threaded onto the ring14. This cover ring may be moved up and down byturning it along the threads. The ring extends outward'ly and downwardlyas shown and the skirt -32 of the ring isprovided with a gasket member'33. This gasket may be made up in the form of" astrip of woven asbestostubing 34 which is drawn over a split spring ring,

34. The split ring will hold the gasket in place in the skirt of thecover ring 31 and provide a very eilective dustproo-f joint when theglobe is inserted in pla'c' To insert the globe in place the ring-31 isrevolvedbackwardly. to raise it up to the dot and d ash li'ne position.A conventional globe such as indicated a' ahas a lip or rim as indicatedat 36 and an upper covering wall 37. The opening in the upper part ofthe globe is the proper size to permit passing it up over two of thelugs and fingers and turning it about so that the shade will rest on allthree of the fingers. The springs 28 are preferably stiff enough tosupport the globe without permitting the fingers to rest on the feet ofthe lugs. This provides a resilient support for the globe and thesprings equalize the pressure on the undersurfaceof the globe.

The ring 31 is then revolved to lower it to bring it to the full lineposition whereupon the edge of the gasket comes against the uppersurface of the glass globe opposite the ends 27 of the fingers 25.Sufiicient pressure may be applied to compress the springs 28- slightly,thereby insuring that the globe is securely held in place on the globesupporting fingers. a V

The present form of lighting unit is one wherein the globe may bereadily inserted or removed and the entrance of dust, water, in-

sects or other foreign matter is effectively prevented by reason of theconstruction use-d. There will be no tendency for the globe to loosen orrattle when the unit is subjected to successive vibration such as foundon station platforms, and the theft of lamps made more difiicult.

It is obvious that the invention may be embodied in many forms andconstructions within the scope of the claims, and I wish it to beunderstood that the particular form shown is but one of the many forms.Various modifications and changes being possible, I do not otherwiselimit myself in any way with respect thereto.

I claim:

1. A lighting unit comprising a socket support having a plurality ofdownwardly and outwardly extending lugs, and yieldingly supportedfingers carried by the lugs, the fingers extending outwardly to engageunder the rim of a shade.

2. A lighting unit comprising a socket support having a plurality ofdownwardly and outwardly extending lugs, yieldingly supported fingerscarried by the lugs, the fingers extending outwardly to engage under therim of a shade, the outside of the socket support being threaded, athreaded cover carried thereby, and a glass shade resting on the springfingers, with the heel of the shade above the fingers, the cover havinga skirt passing down outside the heel of the shade.

3. A lighting unit comprising a socket support having a pluralityof'downwardly and butwardly extending lugs, yieldingly supported fingerscarried by the lugs, the fingers extending outwardly to engage under therim of a shade, the outside of the socket support being threaded, athreaded cover carried thereby, a glass shade resting on the sprlngfingers, with the heel of the shade above the fingers, the cover havinga skirt passing down outside the heel of the shade, and a gasket carriedinside the skirt of the cover for engaging with the upper surface of theglass =shade to form a dusttight unit.

4. A lighting suit comprising an externally threaded socket support,adownwardly opening lampsocket therein, downwardly and outwardlyextending shade supporting fingers carried by the socket support, and acover cover ring threaded onto thesocket support and having a skirtadapted to be brought down close to the fingers to clamp a shadetherebetween, or raised to permit insertion or removal of a shade.

1 5. A lighting unit comprising an externally threaded socket support, adownwardly opening lamp socket therein, downwardly and outwardlyextending shade supporting fingers carried by the socket support, acover ring threaded onto the socket support and having a skirt adaptedto be brought down close to the fingers to clamp a shade therebetween,or raised to permit insertion or removal of a shade, and a detachablecanopy carried above the socket support.

6. A lighting unit comprising an externally threaded two part socketsupport, a downwardly opening lamp socket therein, shade supportingfingers carried by the lower part of the socket support and adapted toextend outwardly underneath a-shade, and a clamping ring threaded onthe'support and adapted to be brought against the upper surface of ashade resting on the fingers, the portions of the support above andbelow the threads being of larger diameter than the threads and the twopart support being separable to per- ,mit placing the threaded clampingring thereon.

7. A dustproof enclosed lighting unit comprising an enclosing globehaving an opening at the top, a globe support carrying spring supportedfingersengageable underneath the upper surface of the globe foryieldably supporting the globe, and a ring threaded onto the globesupport and having a skirt above the upper surface of the globe andopposite the fingers.

8. A dustproof enclosed lighting unit comprising an enclosing globehaving an opening at the top, a globe support carrying spring supportedfingers engageable underneath the upper surface of the globe foryieldably supporting the globe, a ring threaded onto the globesupportyand a gasket carried by the ring and engageable with theuppersurface bf the globe when the ring is threaded downwardly. V i

9, A dustproof enclosed lighting unit comprising an enclosing globehaving an upper wall provided with an opening, a fixed globe supporthaving fingers engageable under the upper wall of the globe, a ringthreaded on the globe support'and closing the space between its theglobe and the support, and a gasket carried by the ring and passingdownfoutside the heel of the globe to engage the upper surface of theglobe.

10. In a lighting unit, a ring-like member having downwardly andoutwardly extending lugseach provided with slots to receive shadesupporting fingers, shade supporting fingers mounted therein anddisposed above the lugs, and springs for supporting the fingers.

11. In a lighting unit, a ring-like member having outwardly anddownwardly extending lugs carried from the lower edge of the ring, thelugs having outwardly extending feet, fingers overlying the lugs andextending outwardly beyond the feet, the lugs each having a notch toreceive the upper portion of a finger and a slot to receive the upperends thereof, the upper end of the finger being hooked into the slot,and a spring interposed between the foot of the lug and the finger foryieldably supporting the finger above the lug.

12. A lighting unit adapted to be mounted near the ceiling, andcomprising a downwardly and inwardly converging :canopy detachablyfastened to a downwardly extending externally threaded ring carryingdownwardly and outwardly extending shade supporting lugs, and a coverring threaded onto the first ring, the cover ring being confined betweenthe canopy and first ring when these parts are fastened together.

Signed at Meriden, in the county of New Haven and Stateof Connecticut,this 11th day of April, 1928.

LEROY C. DOANE.

